Sprinkler head



Oct- 18, 1932- w. M. ROBINSON ET AL 1,882,922

SPRINKLER HEAD Filed Aug. 27. 1930 Patented ct. 18,` 1932 UNiTED STATES PATENT OFFICE WARD M. ROBINSON, DAVID E. LINDQUIST, HAROLD K. RADER AND LEON M. YOUNG, OF

PORT HURON, MICHIGAN, ASSAIGNORS TO MICHIGAN, A CORPORATION 0F MICHIGAN MUELLER BRASS C0., OF PORT HURON,

SPRINKLER HEAD Application Bled August 27, 1930. Serial No. 478,046.

This invention relates to sprinkler heads, and with regard to certain more specific features, to lawn sprinkler heads.

Among the several objects o-f the invention may be noted the provision of an improved form of sprinkler head adapted to throw a stream of predetermined ineness to a greater distance; the provisionof a device of the class described which is positively centering and adapted to maintain a ycentering adjustment; and the provision of a device of this class which can be simply fabricated from a minimum amount of material. Other objects will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the elements and combinations of elements, features of construction, and arrangements of parts which will be exem liied in the structure hereinafter describe andthe scope of the application of which will be indicated in the following claims.

In the accompanying drawing, in which are illustrated several of various possible embodiments of the invention,

Fig. 1 is a front elevation of the device shown in extended position;

Fig. 2 is a` cross section taken on line 2-2 of Fig. 1, except that the device is shown in retracted position in full lines and in an eX- tended position in dotted lines;

Fig. 3 is a cross section taken on line 3-3 of Fig. 2;

Fig. 4 is an enlarged detail showing a spreader, portions of a cooperating tube being broken away;

Fig. 5 is a view similar to Fig. 4 showing a modified form.

Fig. 6 is a detail section showing a serration; and,

Fig. 7 is an isometric view illustrating a modification.

Similar reference characters indicate corresponding parts throughout the several views of the drawing.

Referring now more particularly to Fig. 1, there is illustrated at numeral 1 an outside body portion tthreaded at the bottom to be attached to a stand pipe such as 3 which pipe connects with a sprinkling system or the ike.

slidably cooperates at its upper end with a collar 13 threaded to the body 1 so that it `is adapted to be moved from the full line position shown in Fig. 2 to the dotted line position shown therein. The slidable outlet 11 has inlet ports l5 at the lower end thereof for receiving water from the pipe 3. A strainer 17 covers the inlet ports and is held in place by a nut 19 threaded to a stem 21, the latter passing upwardly to the hollow center of the slider 11 and being formed upwardly as a head or spreader 23. The stem 21 is threaded into the bottom of the slider 11 the nut 19 functioning, not only to hold the strainer 15, but also to lock the stem 21 in place.

The head 23 is formed as an inverted cone 25 into the lower part of which is machined or otherwise formed a circular groove 27 serving purposes to be described.

Milled or otherwise formed at the side of the cone is a reduced portion or indentation or spreader channel 29. This depressed channel isformed below the surface which the cone 25 would have if the cone were complete but the bottom thereof has about the same angle as the cone, though this is ineidental. Thus it will be seen that the outer surface of the cone cannot be depended upon for seating purposes at the top of the slider 11, because if it were, the ressure of seating would force the stem `21 o center, part of the conical surface being gone. Therefore the circular roove 27 is provided, this groove being suciently undercutto provide a grip around the upper edge of the slidable member 11 thus preventing this oit-centering when the head is drawn down on the nozzle. Thus a uniform spray is obtained. The path of the water is up through the pipe 3, into the opening 15, throu h the slider 11, (which the Water forces t e nozzle 11 to the extended position when pressure is applied) and out through the channel or opening 29. When the device is retracted, as shown in Fig. 2, the conical portion 25 rests on a conical seat 31 inthe collar 13, thus sealing the device against entry of dirt andthe like. The col-A In order that the radius of the spray mayl be increased, the upper edge of the sliding member 11 is serrated vradially'as indicated at numeral 33. A detail of this serration is shown in Fig. 6. Fig. 6 is a detail section showing a serration. It will be seen -that the serrations are radial and extend upwardly and have an ending positioned so as to leave a substantially smooth portion of the periphery 35; hence a definite seal may be effected between the groove 27 and the upper edge of the member -11 at portions where the channel 29 does not exist. We have found that s'errations of .this nature have the advantage of directing the water in definite channels as it leaves the sprinkler, the kinetic energy of the Water bein increased with less loss due to frictional e 'ects such as are caused by eddies and the like. Furthermore, the'fineness of the spray is increased, because the water is initially broken up and not permitted to break itself up by air friction.

In Fig. 7 is shown a form of the invention which is similar to the form already described in all respects, except that the collar 13 which has the conical seat 25 is extended outwardly and upwardly from this so that there may be a circular channel or sump 37 cut in its uppersurface, the upper surface being substantially flat to form a seat. Also the conical head 23 is extended upwardly from this provided with mushroomshaped closing cap 39. The purpose of elongating the head 23 is to cause the cap 39 to clear the spray emanating from said head 23. The purpose of the head 39 is to seat flatly upon the upper flat surface of the collar 13 and close the sump or channel 37 and protect the other parts from entry of foreign material.

Thus when the mushroom head 39 is down, that is, when the water is turned off, there is a protection against the entry of dirt. At the same time any water that does settle back into the device, must do so between the cap 39 and the upper surface of the collar 13. This may take place by capillary or similar action but at all events it is a slow entry. Thus the water must enter slowly and must pass through the channel or sump 37 where it gathers as a pool, its velocity being reduced almost to zero. Any dirt or the like 'in the Water settles into this sump and only parting from the scope of the invention,`it`

is intended that all matter contained in the above description or shown in the accom-l panying drawing shall be interpreted as illustrative and not in a limiting sense.

We claim:

1. In a sprinkler head, a water-ejecting nozzle, a stem threaded interiorly into and spaced from said nozzle, and adapted to be drawn down therein, a conical head on said stem, a groove in said head for seating a circumferential portion of said head on the edge of said nozzle, thereby to prevent water discharge in the region of said seating and means in said head providing a recess for ejecting water in the circumferential region of said head and not seating on said edge.

2. In a sprinkler. head, a 'Water-ejecting nozzle having a serrated edge, a stem threaded interiorly into and spaced from said nozzle, a conical head on said Stem, a groove in said head for seating a circumferential portion of said head on said edge of said nozzle, thereby to prevent water discharge in the region of said seating, means in said head providing a recess for ejecting Water in the circumferential region of said head not seating on said edge.

In testimony whereof, we have signed our names to this specification this 12th day of August, 1930.

WARD M. ROBINSON. DAVID E. LINDQUIST. HAROLD K. BADER. LEON M. YOUNG. 

